Arduino: 1.8.13 (Mac OS X), Board: "Error compiling Arduino Mega or Mega 2560"

Using Arduino Installation & Troubleshooting
#1

This problem was presented before for 1.8.10, but the thread is closed. I have a Mega 2560 with a Ramps 1.4 shield. I get the error message for 1.8.13.

The Board info window says
BN: Unknown Board
VID: 1A86
PID: 7523
SN: UPload any sketch to obtain it

#2

Please post the FULL ERROR & Code (Or link to the code)